Door lock



Sept. 21, ms. M L GAN 2,449,711

DOOR LOCK s Shets-Sheet 1 Filed May 24, 1945 s 4 9 rrw w :u 3 W e 4 M W5 d 8 w w s 1 6% 5 9 w M 6 syv 0 4 J6 a w 9 7 e. w e\ a. e a wa a wow 9\h, w a $4 a Sept. 1, 1948. I J. H. MELLIGAN 294495711 DOOR LOCK FiledMay 24, 1945 3 Sheets-Sheet 2 1520882308 Jwefiza 9 H M Jam. 3308 3289Sept- 19480 J. H. MILLIGAN 2,44%?M DOOR LOCK Filed May 24, 1945 www 3Sheets-Sheet 5 Patented Sept. 21, 1948 W t ST ii ii 1 This inventionrelates to door locks and especially to'that'type of door lock in whichone of the door knobs, usuallythe outer door-knob, has a lockmech'anisniincorporated therein and- 1s normally locked irom turning movement butcan 5 be unlocked by means of a key so that it can be I turnedtowithdraw the door latch when the door is to be opened. In doorshavingdoor knobs for opening the door the two knobs are commonly mounted fonafiat sided spindle which extends through the door and which carries acollar having arms that cooperate with fingers with'which the'door latchis provided, so that when either knob is turned theresultantturningmovernent of the spindle operates to withdraw the doorlatch. I

It is one of the objects of my present invention to provide a novel doorlock of theabovementioned'type which can be readily substituted for'theordinary pair of knobs and spindle 'of any doorwithout-making anyimportant alteration in the door itself, whereby" a door which isprovided withdoo'r-knobs but not provided witha lock can be easilyconverted into a door having a door lock which can beu'nlo'cked by'theuse ofakeyJ Ahotherob'ject' of the invention isto provide a door lock ofthis type with means by which a person on the-inside of the door maysetthe lock in the'nutside knob so that turning movement of said"outsideknob will be inefiec'tive to withdraw the door latch, therebymaking it impossible for a-person on the outside to open the door eventhough he has the proper key. A further object of the invention is toprovide a novel means whereby the lock can be set from the outsidesothat the outside knob will'remain unlocked and can, therefore, be turnedto withdraw the door latch without the use of'a-key.

Further objects of the invention are to provide various novelffea'turesrelating to door locks o f this type whichvrill be more fullyhereinaftrsetforth andjthen pointed out in theclaims;

In the drawings wherein I have illustrated a selectedembodiment of myinvention, fl 'ig. 1 is a fragmentary section of a door having a doorlatch and showing theoutside knob in end 1 I f I y: Fig. 2 is a sectionon the line 22, Fig. 1; Fig; 3 is asection on the line 3---3,Fig. 1.Fig. 4 is a section on the line 4-4, Fig. 1. Fig. 5-isasection onsubstantially the line 55, Fig.2;

Fig. 6 is a section on the line 6-6, Fig. 7. Fig. 7 is a section on theline 1-4;, Fig. .2.

Fig. 8 is a section on the line 8-8, Fig. 2. Fig. 9 is asection on theline 9-43,. Fig. 3. I Fig. l0-is a perspective view of theknob-supporting member 'for the outer knob. Fig, l l is a longitudinalsection through the knob-supporting member. I

11 clams. (Cl. 70- 215) 'efthe door is Fig. 12 is a sectional view onthe line 33, Fig. 1 showing the position. offthe parts when thespincllehas beenvun'clutchedfrom the outer knob. i vFig; 13 is aperspective view of' the plate secured to'the inner knob:andwhichformspart ofzthe means for unclutching thespindle' from the outer knob whenthe inner knob is turned. 1 .5 1 Figzl l is' :apersp'ective viewof thesupporting member carried "by'rthe spindle on which the inner knob ismounted: r

Figsfi15 and '17 are fragmentary sectional views illustrating thepart'sr for unclutching'thespindie from: theouter knob when theinneru'knob is turned. r I

Fig. 16 is a section on the line lfilti, Fig. 12.

Fig. 18 is a fragmentary sectionalvie'w showing the'means-forreturningvthe'outer knob :to its central position. i v -In:athe drawings-I indicates a portion of a door which is'equipped with the usualspringpressed door latch 2, the latter having a body portion-swhichrisreceived withina housing i that'is setintoa recess 5. with whichthe :door is provided; the fronttplate- 6- ofthe housing having anzopen-ingithrough; which thenose'l of the door latch projects. -Thebodyof thedoorlatch is providedwith two rearwardly extending arms 3having at-their ends:inturnedfingers il -that co-operatewith arms itstormed on a collar: :1 i .that.is-provided with" a squarehole andismounted on the square spindle of theldoor knob structureso-thatwheneither knob is turned, the resultant turning movementto-f the spindle.will turnttheueollar fll [and will, through the co-soperation of eitherarm it; and its co-operating finger 9,. withdrawthe door latch 2againstthe action of a springsllz which normally holds: the latchyieldingly. in its projectedposition.

fi his typev oidoorlatch isione which is com" 1 only .used..- As statedabove my invention in- 1 es apaiiwof knobs. having a door lockincorporated therein and a spindle associated therewith. whichknobsandspindle can .be substituted an ondinary pair of knobszin adoorhaving t 1 door lat-ch aboveudescribed; thereby convertthe door into one.whichcanbe locked and ich requiresthe use lofiakey for unlocking it.device herein illustrated the outside knob v indicated at .13, and the.inside knob at i i. These two, knobs are connected by square sidedspindle l5 .whichextehds. through the door'andgthrough the quare openingin the collar H.

The outside knob 13 is mounted on a stationary knob supporting meniberit. which i-s stationarily secured to the door 1'. This knob-supportingmember has an inner portion ll of large diam-- 'eter and anouter'portion it of smaller. diameter. The knob-supporting member may bestationarily attachedto'ithedoor l "in any approved way.

As herein shown the inner end of the knob-supporting member has securedthereto by means of screws i9 an attaching disk which is provided withtwo attaching lugs 2|. Secured to the door I by means of screws 22 is ananchoring plate 23 that is provided on its outer face with a recess 24adapted to receive the attaching disk 23. ihe anchoring disk 23 isprovided with two openings 25 adapted to receive the studs 2 I, eachstud being cut away on one side to provide a notch 26. In securing theknob-supporting member it to the door, the studs 2| are entered throughthe openings 25 in the anchoring plate 23 and then the knob-supportingmember is turned slightly about its axis to bring the edges of theopenings 25 into the notches 26, and thereby the knob-supporting memberwill be firmly secured to the anchoring plate 23. The door itself may beprovided with a recess 21 to accommodate the inner ends of the studs 2|as shown in Fi 4.

The attaching plate 20 is provided with a radially extendingspring-pressed locking pin 28 which is backed by a spring 29 and whichis adapted to enter a recess 30 with which the anchoring plate 23 isprovided, thereby locking the knob-supporting member l6 from turningmovement after it has been properly assembled with the anchoring plate23. The flange of the outer knob that encloses the attaching plate 20 isprovided with an aperture 3| through which a wire may be inserted todisengage the locking pin28 from the reces 30 when it is desired toremove the knob-supporting member l6 and the outer knob f3. 7

The outside knob I3 is provided with a central cylindrical chamber 32having a diameter the same as that of the larger portion H of theknobsupporting member l6, which larger portion occupies the inner end ofsaid chamber 32. Situated within the chamber 32 at the outer end of theknob is a barrel element 33 which is provided with a central opening 34of a size to fit the smaller portion I8 of the knob-supporting member.This barrel element 33 is secured in place by means of a screw I34whichextends through the barrel from the inner end, and the outer endofwhich screw has screw-threaded engagement with a, nut 35 carired bythe knob. The barrel element 33 is thus rigidly secured to the knob andpractically forms a part thereof.

The outside knob I3 is connected to the spindle l5 through themedium ofa clutch device which is normally engaged but which can be disengagedfrom the inside of the room, as will be presently described.

The outer end of the spindle i5 is formed with a flange 33 that isreceived in an axial recess with which the knob-supporting member I6 isprovided. Projecting from the flange 36 are two pins 31 which extendthrough a clutch flange 38 that is also received in said recess 40. Theclutch flange 38 has a clutch pin 39 extending outwardly therefrom whichpasses through an arcuate opening 90 formed in the larger portion I! ofthe knob-supporting member l6 and the extremity of which is adapted toengage in a clutch recess M with which the inner face of the barrelmember 33 is provided. When the parts are in their operative positionshown in Figs. 2 and 3 with the clutch pin 39 occupying the recess 4!,turning movement of the knob l3 on the knob-supporting member willoperate through the clutch pin 39, clutch disk 38, pins 31 and flange 36to turn, the

For this purpose the barrel element 4 fiat sided spindle l5, thereby toturn the collar II and withdraw the door latch 2.

The outer knob i3 is normally locked to the stationaryknob-supportingmember l3 so that the knob cannot be turned, but the knob can beunlocked from said knob-supporting member to permit it to be turned bymeans of a suitable key. 33 is provided with a radial opening 43 intowhich is received a radially extending locking pin 42 that is backed bya spring 44. The inner end of this locking pin 42 is adapted to engagein a recess 65 with which the portion l8 of the knob-supporting memberis provided, and when the locking pin is in its normal position shown inFigs. 2 and 7, the knob 13 will be locked from turning movement.

The barrel element 33 is provided with an opening in which is received akey plug 46 having a key slot 41 therein. Said plug and barrel elementare provided with the usual set of tumbler and follower pins (not shown)which normally lock the plug' 43 from turning movement but which becomelined up to free the plug when a key is inserted into a key slot 41 asusual in socalled Yale locks.

Y The plug 46 is provided on one side with a shoulder 48 adapted toengage the inner end of a pin 49 that is slidably mounted in the barrelelement 33. The locking pin 42 is formed at its outer end with a head 50having a portion overlying the pin 49.

When a proper key is inserted into the key slot 41 thertumbler andfollower pins will be lined up and the plug 46 will be freed for turningmovement. The turning of the plug by the key in a counterclockwisedirection, Fig. 7, will operate through the shoulder 48 to raise the pin49 and thereby lift the locking pin 42 against the action of its spring44 and out of engagement with the portion l8 of the knob-supportingmember, thereby unlocking the knob and freeing it for turning movement.When the knob is thus unlocked, the turning movement thereof willoperate through the clutch pin 39, clutch disk 38, pins 31 and flange 36to turn the spindle l5 and thereby withdraw the door latch 2. With myimprovement the outer knob of the door will be normally locked so thatit cannot be actuated but it can be unlocked by means of a suitable keyto permit it to be turned and thereby to withdraw the door latch.

The inner knob 14 is so constructed that it can be operated to turn thespindle l5 and thus withdraw the door latch 2 even though the outer knobis locked, so that a person on the inside of the room can always openthe door.

For this purpose means are provided whereby an initial turning movementof the inner knob 14 will disengage the clutch pin 39 from its socket 4|in the outer knob, thus freeing the spindle from the outer knob so it isfree to turn, and further turning movement of the inner knob will thenrotate the spindle [5 to withdraw the door latch 2.

Secured to the inner end of the spindle I5 is a supporting collar 5|which is inserted in a chamber 52 with which the inner knob M isprovided, said collar 5| being secured to the spindle 15 by means of asuitable set screw 53. a

The clutch disk 38 carrying the clutch pin 33 is mounted on the end of astem 54 which extends through an axial bore 55 with which the spindle isis provided. The outer end of this bore is enlarged and receives aspring 56 which 5 acts against the clutch disk 38 and normally holds itin itsoperati-ve clutchin position. i

The supporting collar 5| is providedwith .a plurality of throughopenings 53 extending parallel to the spindle, in each of which openingsis received a thrust pin 5?. The inner end of each opening 58 iscounterbored, land the inner .end of each thrust pin isenlarged to litthe counterbore as shown .at 59. Situated .in each counterbore is-asplll'iglfiflwhich normallytends to hold the thrust pin in its :forwardor inward position. 'The inner enlarged end 59 of each thrust pin iscone-shaped and is normally re ceived in a'vnotch 5| formed in aplate 62which is secured to theinner face of the inner knob M by suitable'screws99.

The plate .62 is provided with a boss es in the face of which the Vnotches'iil are formed. This boss is cut. away at M to provide aspace'bounded by the two abutment walls 95 in which is receivedtaprojection 93 extending from the inner endof the supporting collar 56.The space betweenithe abutmentwalls 9 5 is somewhat greater than'thewidthtof the projection'dfi, thereby providing a certain amount of looseplay between the projection and the abutment walls '55, the purpose ofwhich will'be presently described.

The stemtild extends-through and beyond the end of the'spindle,saidprojecting portion of the stem being screw threaded and having screwthreaded .theretoa thrust collar :63 whichfits the chamber-:52 of thenknobil l and isbacked by a suitablespring 6 8. The spring t lyieldingly holds the thrust collar 63 in engagement with the outerface'of the supporting collar 5! as shownrin Figs. 2 and 3. The thrustcollar $3 is shown as having a reducedfinner endfiii which fits withinan axial recessin the outer end of the supporting collar 5 l Figs. 2 and3 show the knobs l4 and the parts therein in normal position with thethrust collar 63 in engagement with the outer face of/the supportingcollar. iii and with the-inner pointed ends of the thrust pins 5?occupying the notches 6|.

With the parts in this position the clutch pin Zia-will be in engagementwith the notchd t in the knob-supporting member to, and thespindle l5and the supporting collars! which is mounted thereon will thus belocked'from turning movement.

"When the inner knob id is turned. this turning movement is communicatedto the plate 62 which is secured to the knob,and during the initialturningmovementof the plate 62 the faces of the V-notch'es 6i will'havea carnming action against the pointed ends'of the'thrust pins 5? andwill thus force them backwardly, it being understood that the spindle fil, and consequently the supporting collar 5!, is stationary at thistime. This backward movement offthe thrust pins is communicated tothethrust collar'fi's which-isscrew threaded to the stem 5% and thus thethrust collar'and stem will-be moved to the right in Figs. 2 audit,thereby moving the clutch collar 38 to the right and withdrawing theclutch pin 39 from its socket Mas shown in Fig-12. By this operation thespindle i5 is unclutched from the outer knob.

-The-lost motion between the projection Qdand the abutment walls 95permits this initial turning movementof the knob it while the spindleisstill locked from turning movement. By the time the'knob has been turnedto'bring one ofthe walls 95into-engagement'with the projection ilti onthesupportingcollar .51, the spindle will have been unclutched from theouter knob 13 and fur ther turning movement of the inner knob I4 willoperate through the engagement of one of the abutment walls 95 with theprojection 9b to turn the spindle 15 and thereby withdraw the door latch2.

When the-inner knob :14 has been released and has beenireturned to itsnormal central position, the springs as and t5 co-operate {to return theclutch disk 33 to its normal operative position shown incFig. 3, therebyagain clutching the outer knob "l31to the spindle 55. When the innerknob has again resumed its normal central position, the thrust pins '51will be in line with the V notches *6! and the springs 6d will restoresaid thrust pins into their normal position shown in Fig.2.

Ihave provided herein means for automatically returning the knob M toits normal position after it --has;been :turned to retractlthe doorlatch and hasbeen released. l'ihe plate-E2 is provided with a projection'66 which .is located between two spring-pressed followers til carriedby the rose it. This rose is provided with an arcuate slot lid in whichis received a return spring 7d, the ends of which abut against the twofollowers bl. Said rose is also formed with two stops ll to limit thespring-pressed movement of the followers.

When the inner knob M is turned in either direction,-the projection 66will engage one of the followers and will thus compress the spring it?so that when the knob is released the expanding action of the springwill return it to itsnormal position.

"My improved lock is also provided with means whereby a person on theinside of the door can disengage-the clutch pin from its socket tiandlock the clutch in its disengaged condition, thereby making itimpossible for anyone toopen the door from the outside even though hehas the properikey. Screw threaded to the end of the stemjfit is a nutl5 having a head portion "is which'projects beyond the knob it so that aperson can readily grasp said nut. By pulling b-ackwardly on the nut,the stem at and clutch disk 38 is moved to the right, 1 and 2,therebydisconnecting the-clutch pin ts from its socket ll.

The knob M is provided with a spring-pressed locking pin Tiwhich-engages the nut l5 and the latter is formed with a recess it inone side at i-tsinner-end adapted to receive the locking pin ll when theknob is pulled inwardly as shown in Fig. 12. Whena person on the insideof the room desires to make it impossible for a person to; enter theroom from the outside, he will pull outwardly on the nut iii, thusdisengaging the clutch pin dt from its socket ll and when the nut FE-hasbeen thus withdrawn, the locking pin 'll snaps'into the recess l8,thereby locking the stem andthe clutch disk 36, in their retractedposition. So long as the clutch pin remains in its retracted position,the outer knob It will be disengaged from the spindle l5 so that even ifa person unlocks the outer knob l 3 with the proper key, yet the turningmovement of the unlocked knob willnot be communicated to the spindle andthe knob will simply turn freely on the knobsupporting member l6.

The side walls of the notch or recess 78 are inclined so that if theinner knob M is turned whilezthelocking pinl'i is occupying the notch78, the inclined side faces of the notch will cam the locking pin llbackwardly, thereby releasing the nut 15 andallowing the stem 54'withits clutch disk 38 to move back into its normal operative position underthe influence of springs 56 and 54.

I have also provided herein means whereby a person on the outside of thedoor can set the lock for the outside knob l 3 in an inoperativeposition so that a person can turn the outside knob l3 to open the doorwithout the use of a key. Slidably mounted in the outer knob 13 is aplunger 80 from which extends an arm 8| having at its end an inclinedface 82 that is adapted to engage the underside of the head 50 of thelocking stem 42 when the plunger 80 is pushed inwardly, thereby holdingsaid head 50 raised. When therefore the head 58 has been raised byinserting a key in the key slot 31 and turning the plug 46, thusunlocking the outside knob i3, and said plunger 88 is pushed inwardly tomove the face 82 of the arm 8! underneath the raised head 5!), said armill will hold the head 5!] raised and thus hold the outer knob in anunlocked condition. The plunger 8D is provided with two notches 83 whichcooperate with a spring-pressed locking pin 84 to retain said plunger ineither its normal or its inward position.

The knob 53 is also provided with a restoring plunger 85 which issituated at right angles to the plunger 88 and which is constructed sothat when the restoring plunger is pushed downwardly it will restore theplunger 88 to its normal position. The restoring plunger 85 is normallyheld in its raised position by means of a spring 86, and theconstruction is such that when the restoring plunger 85 is depressed, itwill engage the cam face 96 on the plunger 80 and will move the latterbackwardly into its normal position.

Whenever it is desired to leave the door unlocked so that it can beopened without the use of a key, the plunger so will be pushed inwardly,thereby raising the locking pin 42 out of engagement with the portioniii of the knob-supporting member, and so long as the plunger 80 remainsin its inward position, the knob will remain unlocked so that the doorcan be opened from the outside without the use of a key.

By simply depressing the restoring plunger 85 the plunger 88 will berestored to its normal position, thus allowing the spring 44 to returnthe locking pin 42 to its locking position.

In Fig. 18 I have shown means which may be employed for returning theouter knob to its central position after it has been turned. For thispurpose, the outer knob i3 is provided on its inner face with aprojection 88 which enters an annular groove 81 formed in the attachingplate 2311 which is secured to the door I. Located within this annulargroove BI is a spring 90, the ends of which engage two followers 89between which the projection 88 is located. The attaching plate 23a isshown as provided with two stop shoulders ll which limit the springimpelled movement of the followers 89.

When the knob I3 is turned in either direction, the projection 88thereon will engage one of the followers and will thus compress thespring 99 so that when the knob is released, the expanding action of thespring 98 will return said knob to its initial or central position.

I claim:

1. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on saidknobsupporting member, a key-actuated locking meansfor normally locking the outer knob to the knob-supporting member, alatch-actuating spindle adapted to extend through the door and to beoperatively coupled to the door latch, means separate from saidkey-actuated locking means for normally connecting the spindle to theouter door knob, whereby turning movement of the kob when unlocked willturn the spindle, an inner door knob mounted on and connected to thespindle on the inside of the door and by which'the spindle may beturned, and means operative from the inside of the door to disconnectsaid spindle from the outer knob thereby releasing said spindle forturning movement by the turning movement of the inner knob andsimultaneously rendering the outer knob, when unlocked, ineffective toturn the spindle.

2. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on said knob-supporting member, a key-actuated lockingmeans for normally locking the outer knob to the knob-supporting member,a latch-actuating spindle adapted to extend through the door and to beoperatively coupled to the door latch, means separate from saidkey-actuated locking means for normally connecting the spindle to theouter door knob, whereby turning movement of the outer knob whenunlocked will turn the spindle, an inner door knob mounted on andconnected to the spindle on the inside of the door and by which thespindle may be turned, means operative from the inside of the door todisconnect said spindle from the outer knob thereby releasing saidspindle for turning movement by the turning of the inner knob andsimultaneously rendering the outer knob, when unlocked, ineffective toturn the spindle, and means to lock the spindle so disconnected.

3. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on said knobsupporting member, a key-actuated locking meansnormally locking the outer knob to the knob-supporting member, alatch-actuating spindle adapted to extend through the door and to beoperatively coupled to the door latch, a clutch device separate fromsaid key-actuated locking means for normally connecting the spindle tothe outer knob, whereby turning movement of the outer knob when unlockedwill turn the spindle, an inner door knob mounted on the spindle on theinside of the door, and means operative from the inner knob todisconnect said clutch device, thereby releasing the spindle for turningmovement by the turning of the inner knob and simultaneously renderingthe outer knob, when unlocked, ineffective to turn the spindle.

4. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on said knob supporting member and provided with a keyslot, means normally locking the outer knob to the knob-supportingmember, means actuated by a key inserted into the key slot to unlock theouter knob from the knob-supporting member, a latchactuating spindleadapted to extend through the door and to be operatively coupled to thedoor latch, means normally coupling said spindle to the outer knob,whereby turning movement of the unlocked outer knob will turn thespindle and thereby unlatch the door, an inner knob mounted on thespindle n the inside of the door and free for limited turning movementrelative to the spindle, and means rendered operative by such limitedturning movement of the inner knob to uncouple the spindle from thelocked outer knob thereby releasing said spindle for turning movement bythe continued turning of the inner knob.

5. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstatlonarily securing said member to the outside of the door, an outerknob mounted on said knobsupporting member and provided With a key slot,means normally locking the outer knob to the knob-supporting member,means actuated by a key inserted into the key slot to unlock the outerknob from the knob-supporting member, a latchactuating spindle adaptedto extend through the door, a clutch normally connecting the spindle tothe outer knob, whereby turning movement of the unlocked outer knob willturn the spindle and thereby unlatch the door said clutch including aclutch pin associated with the spindle and a pin-receiving recess withwhich said outer knob is provided, an inner knob mounted on the spindleon the inside of the door and free for limited turning movement relativeto said spindle, and means rendered operative by such limited turningmovement of the inner knob to Withdraw the clutch pin from said recessand thereby release the spindle from the locked outer knob and free itto be turned by the inner knob.

6. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on said knob-supporting member and provided with a keyslot, means normally locking the outer knob to the knob-supportingmember, means actuated by a key inserted into the key slot to unlock theouter knob from the knob-supporting member, a latch-actuating spindleadapted to extend through the door and to be operatively coupled to thedoor latch, means normally coupling said spindle to the outer knob,whereby turning movement of the unlocked outer knob Will turn thespindle and thus unlatch the door, an inner knob mounted on the spindleon the inside of the door and free for a limited turning movementrelative to the spindle, and means rendered operative by the initialturning movement of the inner knob to disconnect the spindle from thelocked outer knob thereby releasing said spindle for turning movement byfurther turning movement of the inner knob.

7. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on said knobsupporting member, releasable locking meansnormally locking said outer knob to the knobsupporting member, alatch-actuating spindle adapted to extend through the door, said spindlehaving an axial bore, an inner knob mounted on said spindle, a clutchelement associated with and operative when the latter said spindle forturning movement therewith and normally having clutching engagement withthe outer knob, a rod extending through the axial bore of the spindleand connected to said clutch element, said rod being operatable from theinside of the door to disengage the clutch element from clutchingengagement with the locked outer knob, thereby releasing the spindle forturning movement by the inner knob and simultaneously rendering theouter knob, when unlocked, ineiTective to turn the spindle.

8. A door knob structure as described in claim 7 combined with latchingmeans carried by the inner knob and co-operating with said rod to holdthe clutch element disengaged.

9. A door knob structure as in claim 7 com-- bined with latching meanscarried by the inner knob and co-operating With the rod to hold theclutch element disengaged, and means to release the clutching means byturning movement of the inner knob.

10. A door knob structure for a door having the usual door latch, saiddoor knob structure com-- prising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on said knob" supporting member, a latch-actuating spindlecoupled to the outer knob and adapted to ex tend through the door and tobe operatively connected to the door latch, locking means normallylocking said outer knob to the knob-supporting member, key-actuatedmeans to release said loclring means, a depressible plunger carried bythe outer knob, means associated with said plunger is depressed to holdsaid locking means in released condition, and an inner knob mounted onsaid spindle on the inside of the door.

11. A door knob structure for a door having the usual door latch, saiddoor knob structure comprising a knob-supporting member, meansstationarily securing said member to the outside of the door, an outerknob mounted on said knob supporting member, a latch-actuating spindlecoupled to the outer knob and adapted to extend through the door and tobe operatively connected to the door latch, locking means normallylocking said outer knob to the knob-supporting member, key-actuatedmeans to release said locking means, a depressible plunger carried bythe outer knob, means associated With said plunger and operative Whenthe latter is depressed to hold said locking means in releasedcondition, an inner knob mounted on said spindle on the inside of thedoor, a second depressible plunger carried by the outer knob, and meansactuated by the depression thereof to restore the first-named plunger tonormal position.

JOSEPH I-I. MILLIGAN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 842,834 Hurdle Jan. 29, 1807868,782 Hiltpold Oct. 22, 1907 1,576,574 Claussen Mar. 16, 19261,755,434 Ellingson Apr. 22, 1930 1,804,482 Reif May 12, 1931 1,919,750Rymer July 25, 1933 2,018,093 Schlage Oct. 22, 1935 2,207,143 BrauningJuly 9, 1940 2,282,213 Rolph May 5, 1942

